# Grumpy Old Tech Robot Control vs Hollow

The clearest difference is in-app purchases: Grumpy Old Tech Robot Control at none against Hollow's 3. Grumpy Old Tech Robot Control also leads on iOS requirement (10.3 vs 14.0). Hollow's advantage is update cadence (every 4 weeks vs every 9 months). On price, ads and device support there is nothing between them.

Both are free to download. Hollow sells 3 in-app purchases, starting at $1.99 per 7 days. Grumpy Old Tech Robot Control asks for nothing beyond the download.

Grumpy Old Tech Robot Control ships an update every 9 months, Hollow every 4 weeks. The most recent releases landed on October 15, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Grumpy Old Tech Robot Control | Hollow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (9 ratings)](https://appshunter.io/ios/app/hollow-ghost-box-evp-and-sls/id6781119666/reviews)** |
| Number of ratings | — | **9** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 4 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 14 MB | 84 MB |
| Requires iOS | **10.3** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Inzant Australia PTY LTD](https://appshunter.io/developer/1491875116) | [少雄 路](https://appshunter.io/developer/1866520462) |

## What reviewers say

### Grumpy Old Tech Robot Control

[App page](https://appshunter.io/ios/app/grumpy-old-tech-robot-control/id1379828627)

**In-app purchases:** none


### Hollow

[App page](https://appshunter.io/ios/app/hollow-ghost-box-evp-and-sls/id6781119666)

Transform your device into a paranormal investigation kit with tools like an EMF meter, spirit box, and EVP recorder. Capture spooky moments with AR ghosts and SLS cameras, then share your findings. This is an entertainment experience designed for fun, not a real paranormal detector.

**Highlights:** K2 / EMF Meter, Spirit Box, EVP Recorder, SLS Camera, AR Ghosts, Shareable Reports

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hollow Pro Weekly | $1.99 | per 7 days |
| Hollow Pro Yearly | $9.99 | per year |
| Hollow Pro Lifetime | $14.99 | one-time |


## Frequently asked questions

### Is Grumpy Old Tech Robot Control free?

Grumpy Old Tech Robot Control is free to download, with no in-app purchases.

### Is Hollow free?

Hollow is free to download, with in-app purchases available.

### Do Grumpy Old Tech Robot Control or Hollow have ads?

Neither Grumpy Old Tech Robot Control nor Hollow shows ads.

### Which is updated more often, Grumpy Old Tech Robot Control or Hollow?

Grumpy Old Tech Robot Control ships an update every 9 months, and Hollow every 4 weeks. Most recently, Grumpy Old Tech Robot Control was updated on October 15, 2026 and Hollow on October 13, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*